The Muslim Empire started in 640ad. It spread out of mecca, east to India, west across North Africa and on into Spain. It took about 1oo years to expand most of their empire through military conquest. They were great warriors, if they died in battle they believed that they would go directly to heaven (jihad=war). They treated conquered people fairly-better than previous rulers. The Muslim Empire contributed a lot to our society like mathematics, astronomy, medicine, Islamic law, architecture, banking and they were preservers of Greek and Roman culture.